Car used and not parked, fuel also

So I left my car at the airport around 6am with fuel over half and came back to my tank almost empty (200km or so). Also on collection, there were jumper cables in the car, which do not belong to me and taken back. I then decided to check the trips with the tracker. To my surprise, the car was being driven around Kempton park most part of the day, even late after 21h00. I sent a complaint to Looking 4 Parking as I booked through them but they also never responded. I had the trip report attached I also asked them for a receipt but was ignored. So these people used my car to run their errands and possibly jump-start other cars. I would rather park at the airport and pay about R100 more than have this kind of service